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Preparation method of positive-electrode porous material used by lithium ion battery

A technology for lithium-ion batteries and porous materials, which is applied in the field of preparation of positive electrode materials for lithium-ion batteries, can solve the problems of insufficient contact of raw materials, etc., to overcome the irregular shape of the product, easy to coat the excellent surface, and increase the deintercalation rate Effect

Inactive Publication Date: 2012-09-12
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The invention also provides a preparation method of lithium ferrous phosphate, a positive electrode porous composite material for lithium-ion batteries. The method prepares a precursor liquid through a soft chemical method, which can achieve atomic level mixing between raw materials, and overcomes the problems of raw materials in methods such as solid-phase methods. Defects that cannot be fully contacted, and obtain materials with controllable particle size, uniform particle size distribution, and regular porous spherical or spherical appearance

Method used

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  • Preparation method of positive-electrode porous material used by lithium ion battery
  • Preparation method of positive-electrode porous material used by lithium ion battery
  • Preparation method of positive-electrode porous material used by lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Homogenization treatment of raw materials: Weigh lithium nitrate, ferric nitrate, and ammonium dihydrogen phosphate according to the molar ratio of Li:Fe:P of 1:1:1, dissolve in water, and add carbon black according to the molar ratio of C:Fe to 3:1 , And then add 5g surfactant Tween 80, and make 1000mL suspension slurry (solid content 20wt%) with deionized water. After the mixture was sufficiently stirred in a high-speed disperser for 2 hours, a well-dispersed suspension slurry was obtained as the precursor liquid A.

[0039] Precursor preparation: The precursor solution A is dried and dehydrated with a centrifugal spray dryer. Under a carrier gas pressure of 0.2MPa, the slurry is fed into the spray dryer at a rate of 15mL / min, and the inlet temperature and outlet temperature are kept at 260℃. At around 100°C, the dried powder is collected in a cyclone to obtain a precursor B, which is a black powder.

[0040] Heat treatment: Place the precursor B in a tube furnace under a...

Embodiment 2

[0043] Homogenization treatment of raw materials: Weigh lithium carbonate, ferric nitrate, and phosphoric acid according to the molar ratio of Li:Fe:P of 1:1:1, dissolve in water, add carbon black according to the molar ratio of C:Fe of 2:1, and then add 5g surfactant Tween 80 was prepared with deionized water to make 1000mL suspension slurry (solid content 20wt%). After the mixture was sufficiently stirred in a sand mill for 2 hours, a well-dispersed suspension slurry was obtained as the precursor liquid A.

[0044] Precursor preparation: The precursor solution A is dried and dehydrated with a centrifugal spray dryer. Under a carrier gas pressure of 0.2MPa, the slurry is fed into the spray dryer at a rate of 15mL / min, and the inlet temperature and outlet temperature are kept at 260℃. At around 100°C, the dried powder is collected in a cyclone to obtain a precursor B, which is a black powder.

[0045] Heat treatment: Place precursor B in a tube furnace under argon atmosphere and h...

Embodiment 3

[0048] Homogenization treatment of raw materials: Weigh lithium nitrate, ferric oxide and phosphoric acid according to the molar ratio of Li:Fe:P of 1:1:1, dissolve them in water, and add acetylene black according to the molar ratio of C:Fe of 3:1. Then, 10 g of surfactant Tween 80 was added, and a 1000 mL suspension slurry (solid content 20 wt%) was prepared with deionized water. After the mixture was sufficiently stirred in a high-speed disperser for 2 hours, a well-dispersed suspension slurry was obtained as the precursor liquid A.

[0049] Precursor preparation: The precursor solution A is dried and dehydrated with a centrifugal spray dryer. Under a carrier gas pressure of 0.2MPa, the slurry is added to the spray dryer at a rate of 10mL / min, and the inlet temperature and outlet temperature are kept at 260℃. At around 100°C, the dried powder is collected in a cyclone to obtain a precursor B, which is a black powder.

[0050] Heat treatment: Place the precursor B in a tube furna...

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Abstract

The invention relates to a preparation method of positive-electrode cellular material used by a lithium ion battery, and belongs to the technical field of battery materials. The invention provides a preparation method of used positive-electrode cellular material of ferrous phosphate lithium used by the lithium ion battery, the obtained material has large specific surface area and high porosity, large contact area with electrolyte, improves the deintercalation and intercalation rate of Li+, and is favor of improving the volume and the power density; and the method overcomes the defects that the raw materials can not be fully contacted of methods such as a solid phase method, can obtain the material with controllable grain size, even grain size distribution, with a regular porous sphere or sphere-like shape. The method has simple process, can be continually operated and is easy for industrialization production.

Description

[0001] This application is a divisional application with the invention title of a positive electrode porous material for lithium ion batteries and its preparation method, application date 2007.11.14, application number 200710177320.4. Technical field [0002] The present invention relates to the technical field of battery materials, in particular to a method for preparing positive electrode materials for lithium ion batteries. Background technique [0003] Lithium ion batteries are a new generation of secondary batteries following cadmium nickel and nickel hydrogen batteries. The main factors affecting the performance of lithium-ion batteries are: cathode materials, anode materials, electrolytes, separators, etc., and cathode materials are essential for improving the operating voltage, specific energy, and cycle life of lithium-ion batteries. [0004] Currently commonly used is LiCoO 2 , LiMn 2 O 4 And LiNiO 2 . But the lack of cobalt resources limits LiCoO 2 Application, LiNiO 2 I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1397
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 杨岩峰张敬杰于锋潘顺龙宋广智
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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